For starters, consider another distro if you want to make things easy on yourself. Alpine is probably a poor choice unless you have a reason to use it. I guess you could use it as a desktop if you really want to, but it’s more geared for containers and embedded devices. It uses musl instead of glibc so you will have problems running software that isn’t packaged for Alpine. The issue with Puppy is you will have a hard time getting help when you need it because it’s kind of a niche distro.

For your first time, you’re better off using something more mainstream. You are going to run into some issues and it’s a lot easier finding solutions for popular distros. Debian would be a fine choice because it’s widely used and runs great on older hardware. Beyond that, you could look at Ubuntu, Fedora, PopOS and Mint.